Perhaps Verizon was a bit hasty in its decision to stop growing its FiOS TV and broadband Internet business in favor of wireless partnerships with big cable companies. U.S. regulators have launched a probe into Verizon’s recent wirelessspectrum agreements, which could leave the largest wirelesscarrier walking away empty-handed.

As previously reported, Verizon [2](New York) will pay Comcast (Philadelphia, Penn., U.S.A.), Time Warner (New York) and Bright House (Syracuse, N.Y., U.S.A.) $3.6 billion to license a portion of wirelessspectrum[3] owned (but not in use) by the three cable companies. In return, the cable companies will cross-market Verizon’s phone, video, Internet and cell-phone services to its customers. Verizon also decided to halt the build out of FiOS, which is a direct competitor to the primary services offered by those cable companies. For Verizon, building a broadband[4]Internet infrastructure is most likely more expensive and less profitable than growing its wireless business.

However, Verizon’s deal with the cable companies is now under investigation by the U.S. Department of Justice[5], reports Bloomberg. The DOJ thinks the deal has the potential to hurt competition in the wireless and cable industries.

The wirelessspectrum Verizon is obtaining from the cable companies was licensed out by the government with the intention that it promote additional competition in the wireless service market. This agreement basically does the opposite of that — allowing Verizon to build out its high-speed LTEnetwork and increase the visibility of its existing services. As for Comcast, Time Warner and Bright House, they don’t plan on launching their own wireless service businesses, which means that portion of the wireless spectrum is essentially going to waste.